121806879 has 16 divisors (see below), whose sum is σ = 166119552. Its totient is φ = 79361568.

The previous prime is 121806869. The next prime is 121806889. The reversal of 121806879 is 978608121.

It is an interprime number because it is at equal distance from previous prime (121806869) and next prime (121806889).

It is not a de Polignac number, because 121806879 - 2⁵ = 121806847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121806879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121806829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43644 + ... + 46350.

It is an arithmetic number, because the mean of its divisors is an integer number (10382472).

Almost surely, 2^121806879 is an apocalyptic number.

121806879 is a deficient number, since it is larger than the sum of its proper divisors (44312673).

121806879 is a wasteful number, since it uses less digits than its factorization.

121806879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 121806879 is about 11036.6153779136. The cubic root of 121806879 is about 495.7057293995.

The spelling of 121806879 in words is "one hundred twenty-one million, eight hundred six thousand, eight hundred seventy-nine".